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Library of Congress Subject Areas (1733)
- A General Works (27)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (2)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (21)
- G Geography. Anthropology. Recreation (47)
  - G Geography (General) (19)
  - GB Physical geography (8)
  - GC Oceanography (2)
  - GE Environmental Sciences (44)
  - GF Human ecology. Anthropogeography (2)
  - GN Anthropology (1)
  - GT Manners and customs (1)
- H Social Sciences (379)
  - H Social Sciences (General) (363)
  - HA Statistics (1)
  - HB Economic Theory (52)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (9)
    - HD28 Management. Industrial Management (3)
  - HF Commerce (53)
    - HF5601 Accounting (7)
  - HG Finance (41)
  - HJ Public Finance (10)
  - HM Sociology (21)
  - HN Social history and conditions. Social problems. Social reform (10)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (5)
  - HV Social pathology. Social and public welfare (3)
- J Political Science (6)
  - JA Political science (General) (5)
  - JF Political institutions (General) (1)
- K Law (8)
  - K Law (General) (8)
- L Education (44)
  - L Education (General) (43)
  - LB Theory and practice of education (2)
    - LB2300 Higher Education (1)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (4)
    - LC5201 Education extension. Adult education. Continuing education (3)
- M Music and Books on Music (32)
  - M Music (32)
  - ML Literature of music (26)
  - MT Musical instruction and study (25)
- N Fine Arts (10)
  - N Visual arts (General) For photography, see TR (1)
  - NB Sculpture (1)
  - NE Print media (1)
  - NX Arts in general (9)
- P Language and Literature (29)
  - PC Romance languages (1)
  - PE English (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (1)
  - PN Literature (General) (27)
    - PN1990 Broadcasting (24)
  - PR English literature (1)
- Q Science (742)
  - Q Science (General) (533)
  - QA Mathematics (210)
    - QA75 Electronic computers. Computer science (80)
    - QA76 Computer software (35)
  - QC Physics (35)
  - QD Chemistry (112)
  - QK Botany (12)
  - QL Zoology (5)
  - QM Human anatomy (3)
  - QP Physiology (1)
  - QR Microbiology (53)
    - QR180 Immunology (10)
    - QR355 Virology (4)
- R Medicine (9)
  - R Medicine (General) (7)
  - RT Nursing (1)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (1)
- S Agriculture (150)
  - S Agriculture (General) (139)
  - SB Plant culture (13)
  - SD Forestry (5)
  - SF Animal culture (22)
  - SH Aquaculture. Fisheries. Angling (4)
  - SK Hunting sports (2)
- T Technology (331)
  - T Technology (General) (83)
  - TA Engineering (General). Civil engineering (General) (61)
  - TC Hydraulic engineering. Ocean engineering (6)
  - TD Environmental technology. Sanitary engineering (51)
  - TE Highway engineering. Roads and pavements (20)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (13)
  - TH Building construction (71)
  - TJ Mechanical engineering and machinery (39)
  - TK Electrical engineering. Electronics Nuclear engineering (128)
  - TL Motor vehicles. Aeronautics. Astronautics (7)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (1)
  - TS Manufactures (3)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (3)
- U Military Science (2)
  - U Military Science (General) (2)
- Z Bibliography. Library Science. Information Resources (37)
  - Z004 Books. Writing. Paleography (9)
  - Z665 Library Science. Information Science (21)
  - Z719 Libraries (General) (16)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (4)